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- W207629897 abstract "A study was undertaken to determine the impedance of pacemaker electrode systems at threshold of cardiac stimulation in man. Oscilloscopic waveform measurements of current and voltage at threshold were photographed during pulse generator replacement for pulse durations (PD) of 0.1 to 1 ms. Planimetry was used to find the time integral of current in microcoulombs for constant current, Qi, and constant voltage, Qv, sources, and the corresponding time integrals of voltage in millivolt seconds (mVs), Si and Sv. Qi and Qv versus PD were found to be essentially collinear, which is in agreement with previous findings in dogs. A similar result was found for Si and Sv versus PD. An equivalent mean impedance, Z¯, was postulated where Z¯ = S/Q in ohms. The graph of Z¯ versus PD was found to be independent of stimulation waveshape, provided all measurements were taken at threshold. With the advent of programmable pulse generators a knowledge of electrode impedance at threshold is valuable in evaluating system performance. We suggest that Z¯ as defined above is a useful approximation of electrode impedance." @default.
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- W207629897 date "1981-01-01" @default.
- W207629897 modified "2023-09-23" @default.
- W207629897 title "THE ELECTRODE-HEART IMPEDANCE AT THRESHOLD" @default.
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- W207629897 doi "https://doi.org/10.1016/b978-0-08-027207-8.50056-4" @default.
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